Blowpipe.



P. DUMESNIL.

BLOWPIPB. AYPLIOATION lEILED JULY 11,1907.

Patented Aug. 18, 19M

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PQUL D'MESNL, F PARIS, FRANCE.

' BLOWPPE.

Specification of Letters Patent.

Application led July 11, 1967.

Patented Aug., i8, Mill/lle Serial No. 383,303.

citizen oi' the. llcpublie ci France, residing;l

at laris, Department of Seine. in France, have invented new and useful lmprorements in. llowpipes, of which the following; is n full, clear, and exact description.

This invention relates to improvements in blow-pi pes.

in u greet number oi blow-pipes of known construction, the regulating cones are very short7 about l to 2 centimeters and ci an anglo of more than 300; they are therefore neither long nor tapered and they do not permit a sufficiently precise regulation, the regulating devices beine` further not arranged so that they can be secured in position and the `gas supply therefore becomes easily irregular. The regulating of the combustiv'e gas is effected by means of :1n external. regniating;` screw so that a lateral conduit has to be provided for the gas supply, whereby the construction of the blow-pipe is complicated and becomes difficult to manipulate.

The blow-pipes ot' known construction comprise two members, the secondary or auxiliary blow-pipe being seperate from the main blow-pip although it is fixed to the seme ond this secondary pipe serves for conducting the combustive ges through an outer independent pip, which does not communicete with the blowpipe proper. There are blow-pipes with mechanical supports such as guides or rollers for mechanically actuating` the blow-pipes, but hand blow-pipes hoviir a, guide arm er rincer or u guide roller d directly on the blow-pipe so to in tute 'the manipulation or the same are not lrn'own The present invention has for its object to ohviale the hereinbe'i'fore l. inconveniences et the hand blowpipes oi' known construction and to improve the construction of hand bleu/pipes in such manner that they lie/:ome very simple7 eyasy to ransiioruu possess all the desired advanend edopted to' be used for the execuij kind of wor r to be done by hand end .ior which blow-pipes could be'used. y The imprownnents essentially consist in the particular construction oi the lbody or' Vhe hierin-pipe, which is*composed oi] hree parts, the pcs ion oiisaid parte the one with regarzil to the others being' easy to regulate und said ports being ndeptmi i be secured in amY reunir-eil position so :is to avoid the getting out of order or ourJ of the proper position of the several parte of the apparatus; in the arrangement that :i secondary renu'iveble ond exchangeable blow'pipe is provided in derivation upon the main blowpipe and finally in the application, in connection with a hand blow-pipe7 0i' ay guidearm or linger and of a supporting` roller for vfacilitating the hand-wor 1.

rlhe present invention is hereinafter particularly described in reference to the accompanying drawing in which the same letters oi' reference indicate the same elements end which represent, by way of example, the preferred form of execution or the improved blow-pipe, based upon the principle of Alvergnets air or filter pump, instantaneously transformable und adapted to be used for the various operations to be el'ected by hand.

Figure l represents in section an improved blow pipe destined to be used for soldering. 2 shows in section the main-part of the blow-pipe with the .means for regulating and fixing in position the tapered cones. Fig. 3 is un elevation el the same kind of blow-pipe destined to be used for cutting out.

The main part of the blow-pipe is conr posed of three movable pieces.

ln llig. il the principal part of the blowpipe is designated by l. and it has the shape of a 'pipe internally threaiiled at both ends. This main body .l carries laterally the supply pipe 2 for the combustible gas, a long lined conical pipe 3 for the combustive ges and s conical bored member for regulating the escape ofthe A tubulerjoint 5 is screwed upon pipe-s Q. which has a chamber deseinedto receive a device for preventing the bach burn* ing. The inner cone 3 which is long; and.

tapered is screwed into body Seid inner is bored et S in l direction und carries theI inlet pipe 'l0 he combuetive ith cock ll and yoint ,l2 The pipes sind l0 are connected the one with the other by nie-ene oli a i f ,i3 or in ziny other convenient manner. conical bored member Il screwed into vthe body l and earries the outlet pipe lli for the gas-ous miXtiu-e. in the outer per; of the il bi'u'ed member there are fixed one or more pawls l5, preferably spring in! llueneed, which engage with notches 16 of the crown 17 oi the body l, said crownA being' grailuotml or not, as the euse may be;

seid puwls serving to prevent back "ot-ation of the cone and to maintain the regular gas supply. yThe pipe 1i is conveniently curved and has at its end a tubular joint 18 upon which' the nozzle 1 9 of the blow-pipe is screwed through which the gaseous mixture fiows out. l

rl"he apparatus operates as follows z-The combustible gas fiows in through pipe 2 and expands in the body 1 and in the .conical bored member l', the combustive gas flowing in through pipe l0 and cone 3 and, its pressure being. superior to that of the combustible gas, ittakes the combustible gas along into the pipe 14. The gases admix in said pipe 14; and expand to admix more intimately in flowing out of the nozzle 19. rlhe conical members are very long and tapered, they have a length of more vthan four centimeters and their generating lines forman angle ofV less than 30" so as to insure a very precise regulation. The regulation of the conduits for the combustible gas is effected by means of the conical bored member 4 which is more or less screwed into the body 1 of the blow-pipe and fixed in its position by means of the pawl l5. p

It is evident that, owing to the diminution of the lpressure the vacuum obtained in the improved blow-pipe, and consequentlythe force 'with which the gas is drawn in, is

- much greater than in the devices of known construction. Further, the gases arev much more intimately' admixed in this improved apparatus than has been possible before owing to the different size of the mixingv chambers, so that the blow-pipe can be perfectly used with ordinary lighting: gas.

Fig. Q showsthe device for regulatingA the orifices for the passage of the two gases by means or' 'a third auxiliary removable cone which` is mounted in the conical bored member 3 (Fig. 1). .Afterthe conical l oi'ed member 3 has been screwed into the body 1 an auxiliary cone 2O which is solidv is screwed into the conical tube 3 for regulating the space through which the gas is conducted. The combustive gas from pipe "-10' Hows through the openings 21 which are provided in the shoulder of the cone 20 and escapes through the cone 3. The pawls 15 are destined to avoid any alteration of said passages for the gas. Inv lieu yof the pawls 15 one or two counter-nuts 22 could be employed which have to be screwed home for preventing the getting out of order of thedevce, as has been shown inA Fig. 2 upon the threaded part of the conical bored mem-- ber 4.

Fig. 3 represents the blow pipe used for soldering the same as shown in Fig. 1 but particularly adapted for cutting out and provided 'with an auxiliary tube 2? mounted inv derivation upon the pipe 10 of the blow-pipe.A Said tube 23 serves for direct- 'to the nozzle, 'for the urpose setforth.

ing the jet of combustive gas upon the part of the work piece which has been previously made red hot by the blow pipe, eii'ecting thus the cutting out of said part by local overoxydation. The removable tube is conveniently maintainedA in position by means of a clamp 24 and it has a cock 25. The roller 26 placed upon the pipes near the ends of the same serve for supporting the hand blow pipe, to guide the same and to maintain it continuously at4 the proper distance of the work-piece see Fig. 3). In lieu of the roller 26 any suitable support conveniently arranged so that it can rest upon the work-piece to be cut out may be used, a lateral arm or finger 2'( of said support (see Fig. l) bearing upon the edge of a guide piece which corresponds in shape to the line to be cut out or to be soldered may be employed. If both, the roller 26 and thevfinger 27 are used the blow pipe is supported at two points whereby its sta bility is greatly increased. The cocks 11 and 25 regulate the inflow o1 admission ofv the combustive gas and they can be arranged at any suitable point.

I clainn- 1. A blow pipe comprising a main body, a conduit lateral to the main body and communicating therewith to conduct acetylene gas into the main body, two conical members in -said body disposed one within the other, the outer member communicating with the interior of the body whereby acetylene gas is supplied to the outer member, an inlet pipe communicating with the inner member whereby oxygen gas is supplied to the inner member, said inner member communicating with the outer member to supply oxygenr to mix with the acetylene gas in the outer member, said conical members and body jformed with engaging screw threads whereby the-space between the members'may be varied and the amount of acetylene gas regulated, means for locking the conical members against rotation, a nozzle and a mixing pipe communicating with the outer conical member and nozzle to mix the gases and convey the combustible mixture substantially as described and 2. A )low-pipe comprising a main body,

a conduit lateral tothe main body and communicating therewith to conduct acetylene gas' into the main body, two conical members in said body disposed one within the other, the outer member communicating with theinterior of the body whereby acetylene gas is supplied to the outer member, an inlet pipe .communicating with the inner member whereby oxygen gas is supplied to the inner member, said inner member communicating with the outer member to supply oxygen to mix with the acetylene gas 1n the outer member, said conical members and;y body formeel with engaging setel per'ing am?, guiding the appamfms, che said thead whereby the space beween the men*- bers 'may be varied and the emmene of acety- Iene gas regulated, means, im oekig ehe comcel members egems pretence, mezz/fle and e mixg pipe communicating with the outer conical membe emi momie ie mix the gases and convey the combustible mix# mmiery e being mefed to suppya suppemen'erfy jet of oxygen Le -the seme 15 presenze es met lemain pipe and to ffee the seid je@ upon @the heazed part of the Werk pieee,`se`esemiely ee 'feseribed fer ehe pei-pese e'h. v

PLU DUMESNXL. presence ef- FAUL EUPUY, 

